Re: Window Sensors

["Robert L Bass" <RobertLBass@xxxxxxxxxxx>]

"Crash Gordon" wrote:
>
> Surface mount switches have some advantages;
>
> Alignment problems over time are EASY to spot...recessed switches
> that were difficult to align to begin with are a PITA to find/fix
> when you have a no-set 5 years from now.
>
> They're inside protected from snow/rain, and expansion/contraction
> of wood (even vinylclad moves)
>
> Where I am they are less succeptable to lightning damage.
>
> You can find small ones in various colors so you'll barely see them
> against the window frame.

I've used both types for many years.  I prefer recessed contacts
whenever they can be used which for me is most of the time.  My
business was in CT where almost every home and business has a
basement and an accessible attic.  GE Security (nee: Sentrol) makes a
good switch for use in new wood which *might* contract, though any
good quality new window or door frame should be made of aged wood
(doesn't shrink).  The 1275 sensor has little "wings" on the sides
which allow the switch to fit snugly in a slightly over or under
sized hole.  The switch is also easier to pull out should it ever
need replacement.

Since the sensors are hermetically sealed and we soldered our
splices, moisture has not been a problem IME.

I disagree about lightning damage.  If it hits the line any switch
you use will be toast.  The best way to reduce the likelihood of
lightning damage is to use a bonded ground for all incoming services.

That said, I've used thousands of surface mounted magnetic contacts
over the years.  All other things being the same they hold up as well
as recessed ones.  The only weakness is they are more subject to
impact damage if they're mounted near the floor or on a window sill
that gets a lot of activity.

I prefer the recessed ones primarily because they're not noticeable.

--

Regards,
Robert L Bass

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